WMP crashes in IE6

Got a bit of a problem...obviously...I'm running WinXP Pro and IE 6. Over the last few days, whenever I attempt to view movie clips online the media player window pops up on the screen, not the one from my desktop, but the one being used by the site...it looks like an older version of the wmp...you know what I'm talking about? Anyway, it says that it connects, buffers the movie clip and then starts playing. However, all I get is the audio. No video shows up and I can't stop the stream. If I hit the X on the window, I get the End Task dialog box...

I've not added any new software or hardware for months or changed any settings. I use Norton Security...I've tried disabling it to view the clips but that doesn't work and I've not had to do that in the past anyway. Perhaps one of my settings got changed or something...any help pointing me in the right direction would be greatly appreciated.